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Titolo:
Dislocation structures in cyclically deformed nickel polycrystals
Autore:
Buque, C; Bretschneider, J; Schwab, A; Holste, C;
Indirizzi:
Tech Univ Dresden, Inst Phys Met, D-01062 Dresden, Germany Tech Univ Dresden Dresden Germany D-01062 Met, D-01062 Dresden, Germany
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 300, anno: 2001,
pagine: 254 - 262
SICI:
0921-5093(20010228)300:1-2<254:DSICDN>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRESS-STRAIN RESPONSE; SINGLE-CRYSTALS; COPPER; DEFORMATION; BEHAVIOR; TEMPERATURE; PLASTICITY; AMPLITUDES; FATIGUE;
Keywords:
dislocation structure; cyclic deformation; grain orientation; polycrystals;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Bretschneider, J Tech Univ Dresden, Inst Phys Met, Mommsenstr 13, D-01062 Dresden, Germany Tech Univ Dresden Mommsenstr 13 Dresden Germany D-01062
Citazione:
C. Buque et al., "Dislocation structures in cyclically deformed nickel polycrystals", MAT SCI E A, 300(1-2), 2001, pp. 254-262

Abstract

The effect of the grain orientation and the plastic strain amplitude epsilon (pa), on the saturated dislocation structure was studied on individual grains of cyclically deformed nickel polycrystals by means of scanning electron microscopy using the electron back scattering pattern technique and thechannelling contrast of back scattered electrons. The main features of thedislocation configuration in a grain were found to be essentially determined by the crystallographic axial orientation of the grain. A labyrinth-likedislocation pattern is typical for grains with axial orientations near [001], a patch pattern exists in grains with a loading axis (LA) near [011] and fragmented dislocation walls are dominant in grains with LA near [(1) over bar 11]. Grains with axial orientations in the central part of the stereographic standard triangle contain a bundle arrangement of dislocation structures. All four types of dislocation structures, but mostly the bundle type, can occur together with the ladder structure of persistent slip bands. Cell patterns were found to be a result of a modification of the bundle and patch configuration at high deformation amplitudes. The mesoscopic dimensions of the dislocation patterns turned out to depend on epsilon (pa) in the same way for all grain orientations: while the thickness of regions with high dislocation density is reduced with increasing epsilon (pa), the width ofregions with low dislocation density remains roughly constant. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 06/04/20 alle ore 08:37:39